http://arstechnica.com/gaming/news/2011/06/dead-island-delivers-dark-fun-action-in-single--and-multiplayer.ars?comments=1#comments-bar
Two different ways to play
The game changes depending on how you'd like to play. When I was alone in the single player game I enjoyed the more deliberate pace, and I rejected the few missions available during the demo to simply explore the island and play with the many improvised weapons while killing every zombie I saw. There is a heavy emphasis on melee weapons in this game, which means that the zombies get very close to you, and that's a nerve-wracking experience. It takes practice before you can judge the reach of the many weapons, but soon enough you'll be chopping off heads and legs, or taking out the shambling horrors with thrown weapons.